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Faiss

Hi everyone! I wanted to perform a retrieve to a Retriever with a custom MetadataFilter and I noticed (bc of error logged :p) that its not currently supported by the underlying Faiss VectorStore. Has someone faced something like this? I know one approach would be to change the Faiss Vector Store for other one, but I would like to keep it. Maybe someone stumbled across this πŸ‘€
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The way faiss works, is it only stores an ID to embedding mapping. Its not possible to support metadata filtering with the current faiss library (as far as I know anyways)
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